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1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Copyright (C) 2018 Spreadtrum Communications Inc. | |
4 | * Copyright (C) 2018 Linaro Ltd. | |
5 | */ | |
6 | ||
7 | #include <linux/bitops.h> | |
8 | #include <linux/gpio/driver.h> | |
9 | #include <linux/interrupt.h> | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/module.h> | |
b3241565 | 12 | #include <linux/notifier.h> |
e91d0f05 | 13 | #include <linux/of.h> |
25518e02 BW |
14 | #include <linux/platform_device.h> |
15 | #include <linux/spinlock.h> | |
16 | ||
17 | /* EIC registers definition */ | |
18 | #define SPRD_EIC_DBNC_DATA 0x0 | |
19 | #define SPRD_EIC_DBNC_DMSK 0x4 | |
20 | #define SPRD_EIC_DBNC_IEV 0x14 | |
21 | #define SPRD_EIC_DBNC_IE 0x18 | |
22 | #define SPRD_EIC_DBNC_RIS 0x1c | |
23 | #define SPRD_EIC_DBNC_MIS 0x20 | |
24 | #define SPRD_EIC_DBNC_IC 0x24 | |
25 | #define SPRD_EIC_DBNC_TRIG 0x28 | |
26 | #define SPRD_EIC_DBNC_CTRL0 0x40 | |
27 | ||
28 | #define SPRD_EIC_LATCH_INTEN 0x0 | |
29 | #define SPRD_EIC_LATCH_INTRAW 0x4 | |
30 | #define SPRD_EIC_LATCH_INTMSK 0x8 | |
31 | #define SPRD_EIC_LATCH_INTCLR 0xc | |
32 | #define SPRD_EIC_LATCH_INTPOL 0x10 | |
33 | #define SPRD_EIC_LATCH_INTMODE 0x14 | |
34 | ||
35 | #define SPRD_EIC_ASYNC_INTIE 0x0 | |
36 | #define SPRD_EIC_ASYNC_INTRAW 0x4 | |
37 | #define SPRD_EIC_ASYNC_INTMSK 0x8 | |
38 | #define SPRD_EIC_ASYNC_INTCLR 0xc | |
39 | #define SPRD_EIC_ASYNC_INTMODE 0x10 | |
40 | #define SPRD_EIC_ASYNC_INTBOTH 0x14 | |
41 | #define SPRD_EIC_ASYNC_INTPOL 0x18 | |
42 | #define SPRD_EIC_ASYNC_DATA 0x1c | |
43 | ||
44 | #define SPRD_EIC_SYNC_INTIE 0x0 | |
45 | #define SPRD_EIC_SYNC_INTRAW 0x4 | |
46 | #define SPRD_EIC_SYNC_INTMSK 0x8 | |
47 | #define SPRD_EIC_SYNC_INTCLR 0xc | |
48 | #define SPRD_EIC_SYNC_INTMODE 0x10 | |
49 | #define SPRD_EIC_SYNC_INTBOTH 0x14 | |
50 | #define SPRD_EIC_SYNC_INTPOL 0x18 | |
51 | #define SPRD_EIC_SYNC_DATA 0x1c | |
52 | ||
53 | /* | |
54 | * The digital-chip EIC controller can support maximum 3 banks, and each bank | |
55 | * contains 8 EICs. | |
56 | */ | |
57 | #define SPRD_EIC_MAX_BANK 3 | |
58 | #define SPRD_EIC_PER_BANK_NR 8 | |
59 | #define SPRD_EIC_DATA_MASK GENMASK(7, 0) | |
60 | #define SPRD_EIC_BIT(x) ((x) & (SPRD_EIC_PER_BANK_NR - 1)) | |
61 | #define SPRD_EIC_DBNC_MASK GENMASK(11, 0) | |
62 | ||
63 | /* | |
64 | * The Spreadtrum EIC (external interrupt controller) can be used only in | |
65 | * input mode to generate interrupts if detecting input signals. | |
66 | * | |
67 | * The Spreadtrum digital-chip EIC controller contains 4 sub-modules: | |
68 | * debounce EIC, latch EIC, async EIC and sync EIC, | |
69 | * | |
70 | * The debounce EIC is used to capture the input signals' stable status | |
71 | * (millisecond resolution) and a single-trigger mechanism is introduced | |
72 | * into this sub-module to enhance the input event detection reliability. | |
73 | * The debounce range is from 1ms to 4s with a step size of 1ms. | |
74 | * | |
75 | * The latch EIC is used to latch some special power down signals and | |
76 | * generate interrupts, since the latch EIC does not depend on the APB clock | |
77 | * to capture signals. | |
78 | * | |
79 | * The async EIC uses a 32k clock to capture the short signals (microsecond | |
80 | * resolution) to generate interrupts by level or edge trigger. | |
81 | * | |
82 | * The EIC-sync is similar with GPIO's input function, which is a synchronized | |
83 | * signal input register. | |
84 | */ | |
85 | enum sprd_eic_type { | |
86 | SPRD_EIC_DEBOUNCE, | |
87 | SPRD_EIC_LATCH, | |
88 | SPRD_EIC_ASYNC, | |
89 | SPRD_EIC_SYNC, | |
90 | SPRD_EIC_MAX, | |
91 | }; | |
92 | ||
93 | struct sprd_eic { | |
94 | struct gpio_chip chip; | |
b3241565 | 95 | struct notifier_block irq_nb; |
25518e02 BW |
96 | void __iomem *base[SPRD_EIC_MAX_BANK]; |
97 | enum sprd_eic_type type; | |
98 | spinlock_t lock; | |
99 | int irq; | |
100 | }; | |
101 | ||
b3241565 BG |
102 | static ATOMIC_NOTIFIER_HEAD(sprd_eic_irq_notifier); |
103 | ||
104 | static struct sprd_eic *to_sprd_eic(struct notifier_block *nb) | |
105 | { | |
106 | return container_of(nb, struct sprd_eic, irq_nb); | |
107 | } | |
108 | ||
25518e02 BW |
109 | struct sprd_eic_variant_data { |
110 | enum sprd_eic_type type; | |
111 | u32 num_eics; | |
112 | }; | |
113 | ||
114 | static const char *sprd_eic_label_name[SPRD_EIC_MAX] = { | |
115 | "eic-debounce", "eic-latch", "eic-async", | |
116 | "eic-sync", | |
117 | }; | |
118 | ||
119 | static const struct sprd_eic_variant_data sc9860_eic_dbnc_data = { | |
120 | .type = SPRD_EIC_DEBOUNCE, | |
121 | .num_eics = 8, | |
122 | }; | |
123 | ||
124 | static const struct sprd_eic_variant_data sc9860_eic_latch_data = { | |
125 | .type = SPRD_EIC_LATCH, | |
126 | .num_eics = 8, | |
127 | }; | |
128 | ||
129 | static const struct sprd_eic_variant_data sc9860_eic_async_data = { | |
130 | .type = SPRD_EIC_ASYNC, | |
131 | .num_eics = 8, | |
132 | }; | |
133 | ||
134 | static const struct sprd_eic_variant_data sc9860_eic_sync_data = { | |
135 | .type = SPRD_EIC_SYNC, | |
136 | .num_eics = 8, | |
137 | }; | |
138 | ||
139 | static inline void __iomem *sprd_eic_offset_base(struct sprd_eic *sprd_eic, | |
140 | unsigned int bank) | |
141 | { | |
142 | if (bank >= SPRD_EIC_MAX_BANK) | |
143 | return NULL; | |
144 | ||
145 | return sprd_eic->base[bank]; | |
146 | } | |
147 | ||
148 | static void sprd_eic_update(struct gpio_chip *chip, unsigned int offset, | |
149 | u16 reg, unsigned int val) | |
150 | { | |
151 | struct sprd_eic *sprd_eic = gpiochip_get_data(chip); | |
152 | void __iomem *base = | |
153 | sprd_eic_offset_base(sprd_eic, offset / SPRD_EIC_PER_BANK_NR); | |
154 | unsigned long flags; | |
155 | u32 tmp; | |
156 | ||
157 | spin_lock_irqsave(&sprd_eic->lock, flags); | |
158 | tmp = readl_relaxed(base + reg); | |
159 | ||
160 | if (val) | |
161 | tmp |= BIT(SPRD_EIC_BIT(offset)); | |
162 | else | |
163 | tmp &= ~BIT(SPRD_EIC_BIT(offset)); | |
164 | ||
165 | writel_relaxed(tmp, base + reg); | |
166 | spin_unlock_irqrestore(&sprd_eic->lock, flags); | |
167 | } | |
168 | ||
169 | static int sprd_eic_read(struct gpio_chip *chip, unsigned int offset, u16 reg) | |
170 | { | |
171 | struct sprd_eic *sprd_eic = gpiochip_get_data(chip); | |
172 | void __iomem *base = | |
173 | sprd_eic_offset_base(sprd_eic, offset / SPRD_EIC_PER_BANK_NR); | |
174 | ||
175 | return !!(readl_relaxed(base + reg) & BIT(SPRD_EIC_BIT(offset))); | |
176 | } | |
177 | ||
178 | static int sprd_eic_request(struct gpio_chip *chip, unsigned int offset) | |
179 | { | |
180 | sprd_eic_update(chip, offset, SPRD_EIC_DBNC_DMSK, 1); | |
181 | return 0; | |
182 | } | |
183 | ||
184 | static void sprd_eic_free(struct gpio_chip *chip, unsigned int offset) | |
185 | { | |
186 | sprd_eic_update(chip, offset, SPRD_EIC_DBNC_DMSK, 0); | |
187 | } | |
188 | ||
189 | static int sprd_eic_get(struct gpio_chip *chip, unsigned int offset) | |
190 | { | |
09d158d5 NH |
191 | struct sprd_eic *sprd_eic = gpiochip_get_data(chip); |
192 | ||
193 | switch (sprd_eic->type) { | |
194 | case SPRD_EIC_DEBOUNCE: | |
195 | return sprd_eic_read(chip, offset, SPRD_EIC_DBNC_DATA); | |
196 | case SPRD_EIC_ASYNC: | |
197 | return sprd_eic_read(chip, offset, SPRD_EIC_ASYNC_DATA); | |
198 | case SPRD_EIC_SYNC: | |
199 | return sprd_eic_read(chip, offset, SPRD_EIC_SYNC_DATA); | |
200 | default: | |
201 | return -ENOTSUPP; | |
202 | } | |
25518e02 BW |
203 | } |
204 | ||
205 | static int sprd_eic_direction_input(struct gpio_chip *chip, unsigned int offset) | |
206 | { | |
207 | /* EICs are always input, nothing need to do here. */ | |
208 | return 0; | |
209 | } | |
210 | ||
211 | static void sprd_eic_set(struct gpio_chip *chip, unsigned int offset, int value) | |
212 | { | |
213 | /* EICs are always input, nothing need to do here. */ | |
214 | } | |
215 | ||
216 | static int sprd_eic_set_debounce(struct gpio_chip *chip, unsigned int offset, | |
217 | unsigned int debounce) | |
218 | { | |
219 | struct sprd_eic *sprd_eic = gpiochip_get_data(chip); | |
220 | void __iomem *base = | |
221 | sprd_eic_offset_base(sprd_eic, offset / SPRD_EIC_PER_BANK_NR); | |
222 | u32 reg = SPRD_EIC_DBNC_CTRL0 + SPRD_EIC_BIT(offset) * 0x4; | |
223 | u32 value = readl_relaxed(base + reg) & ~SPRD_EIC_DBNC_MASK; | |
224 | ||
225 | value |= (debounce / 1000) & SPRD_EIC_DBNC_MASK; | |
226 | writel_relaxed(value, base + reg); | |
227 | ||
228 | return 0; | |
229 | } | |
230 | ||
231 | static int sprd_eic_set_config(struct gpio_chip *chip, unsigned int offset, | |
232 | unsigned long config) | |
233 | { | |
234 | unsigned long param = pinconf_to_config_param(config); | |
235 | u32 arg = pinconf_to_config_argument(config); | |
236 | ||
237 | if (param == PIN_CONFIG_INPUT_DEBOUNCE) | |
238 | return sprd_eic_set_debounce(chip, offset, arg); | |
239 | ||
240 | return -ENOTSUPP; | |
241 | } | |
242 | ||
243 | static void sprd_eic_irq_mask(struct irq_data *data) | |
244 | { | |
245 | struct gpio_chip *chip = irq_data_get_irq_chip_data(data); | |
246 | struct sprd_eic *sprd_eic = gpiochip_get_data(chip); | |
247 | u32 offset = irqd_to_hwirq(data); | |
248 | ||
249 | switch (sprd_eic->type) { | |
250 | case SPRD_EIC_DEBOUNCE: | |
251 | sprd_eic_update(chip, offset, SPRD_EIC_DBNC_IE, 0); | |
252 | sprd_eic_update(chip, offset, SPRD_EIC_DBNC_TRIG, 0); | |
253 | break; | |
254 | case SPRD_EIC_LATCH: | |
255 | sprd_eic_update(chip, offset, SPRD_EIC_LATCH_INTEN, 0); | |
256 | break; | |
257 | case SPRD_EIC_ASYNC: | |
258 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTIE, 0); | |
259 | break; | |
260 | case SPRD_EIC_SYNC: | |
261 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTIE, 0); | |
262 | break; | |
263 | default: | |
264 | dev_err(chip->parent, "Unsupported EIC type.\n"); | |
265 | } | |
2788938b CG |
266 | |
267 | gpiochip_disable_irq(chip, offset); | |
25518e02 BW |
268 | } |
269 | ||
270 | static void sprd_eic_irq_unmask(struct irq_data *data) | |
271 | { | |
272 | struct gpio_chip *chip = irq_data_get_irq_chip_data(data); | |
273 | struct sprd_eic *sprd_eic = gpiochip_get_data(chip); | |
274 | u32 offset = irqd_to_hwirq(data); | |
275 | ||
2788938b CG |
276 | gpiochip_enable_irq(chip, offset); |
277 | ||
25518e02 BW |
278 | switch (sprd_eic->type) { |
279 | case SPRD_EIC_DEBOUNCE: | |
280 | sprd_eic_update(chip, offset, SPRD_EIC_DBNC_IE, 1); | |
281 | sprd_eic_update(chip, offset, SPRD_EIC_DBNC_TRIG, 1); | |
282 | break; | |
283 | case SPRD_EIC_LATCH: | |
284 | sprd_eic_update(chip, offset, SPRD_EIC_LATCH_INTEN, 1); | |
285 | break; | |
286 | case SPRD_EIC_ASYNC: | |
287 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTIE, 1); | |
288 | break; | |
289 | case SPRD_EIC_SYNC: | |
290 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTIE, 1); | |
291 | break; | |
292 | default: | |
293 | dev_err(chip->parent, "Unsupported EIC type.\n"); | |
294 | } | |
295 | } | |
296 | ||
297 | static void sprd_eic_irq_ack(struct irq_data *data) | |
298 | { | |
299 | struct gpio_chip *chip = irq_data_get_irq_chip_data(data); | |
300 | struct sprd_eic *sprd_eic = gpiochip_get_data(chip); | |
301 | u32 offset = irqd_to_hwirq(data); | |
302 | ||
303 | switch (sprd_eic->type) { | |
304 | case SPRD_EIC_DEBOUNCE: | |
305 | sprd_eic_update(chip, offset, SPRD_EIC_DBNC_IC, 1); | |
306 | break; | |
307 | case SPRD_EIC_LATCH: | |
308 | sprd_eic_update(chip, offset, SPRD_EIC_LATCH_INTCLR, 1); | |
309 | break; | |
310 | case SPRD_EIC_ASYNC: | |
311 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTCLR, 1); | |
312 | break; | |
313 | case SPRD_EIC_SYNC: | |
314 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTCLR, 1); | |
315 | break; | |
316 | default: | |
317 | dev_err(chip->parent, "Unsupported EIC type.\n"); | |
318 | } | |
319 | } | |
320 | ||
321 | static int sprd_eic_irq_set_type(struct irq_data *data, unsigned int flow_type) | |
322 | { | |
323 | struct gpio_chip *chip = irq_data_get_irq_chip_data(data); | |
324 | struct sprd_eic *sprd_eic = gpiochip_get_data(chip); | |
325 | u32 offset = irqd_to_hwirq(data); | |
7bf0d7f6 | 326 | int state; |
25518e02 BW |
327 | |
328 | switch (sprd_eic->type) { | |
329 | case SPRD_EIC_DEBOUNCE: | |
330 | switch (flow_type) { | |
331 | case IRQ_TYPE_LEVEL_HIGH: | |
332 | sprd_eic_update(chip, offset, SPRD_EIC_DBNC_IEV, 1); | |
84aef4ed | 333 | sprd_eic_update(chip, offset, SPRD_EIC_DBNC_IC, 1); |
25518e02 BW |
334 | break; |
335 | case IRQ_TYPE_LEVEL_LOW: | |
336 | sprd_eic_update(chip, offset, SPRD_EIC_DBNC_IEV, 0); | |
84aef4ed | 337 | sprd_eic_update(chip, offset, SPRD_EIC_DBNC_IC, 1); |
25518e02 | 338 | break; |
7bf0d7f6 BW |
339 | case IRQ_TYPE_EDGE_RISING: |
340 | case IRQ_TYPE_EDGE_FALLING: | |
341 | case IRQ_TYPE_EDGE_BOTH: | |
342 | state = sprd_eic_get(chip, offset); | |
84aef4ed | 343 | if (state) { |
7bf0d7f6 BW |
344 | sprd_eic_update(chip, offset, |
345 | SPRD_EIC_DBNC_IEV, 0); | |
84aef4ed WL |
346 | sprd_eic_update(chip, offset, |
347 | SPRD_EIC_DBNC_IC, 1); | |
348 | } else { | |
7bf0d7f6 BW |
349 | sprd_eic_update(chip, offset, |
350 | SPRD_EIC_DBNC_IEV, 1); | |
84aef4ed WL |
351 | sprd_eic_update(chip, offset, |
352 | SPRD_EIC_DBNC_IC, 1); | |
353 | } | |
7bf0d7f6 | 354 | break; |
25518e02 BW |
355 | default: |
356 | return -ENOTSUPP; | |
357 | } | |
358 | ||
359 | irq_set_handler_locked(data, handle_level_irq); | |
360 | break; | |
361 | case SPRD_EIC_LATCH: | |
362 | switch (flow_type) { | |
363 | case IRQ_TYPE_LEVEL_HIGH: | |
364 | sprd_eic_update(chip, offset, SPRD_EIC_LATCH_INTPOL, 0); | |
84aef4ed | 365 | sprd_eic_update(chip, offset, SPRD_EIC_LATCH_INTCLR, 1); |
25518e02 BW |
366 | break; |
367 | case IRQ_TYPE_LEVEL_LOW: | |
368 | sprd_eic_update(chip, offset, SPRD_EIC_LATCH_INTPOL, 1); | |
84aef4ed | 369 | sprd_eic_update(chip, offset, SPRD_EIC_LATCH_INTCLR, 1); |
25518e02 | 370 | break; |
7bf0d7f6 BW |
371 | case IRQ_TYPE_EDGE_RISING: |
372 | case IRQ_TYPE_EDGE_FALLING: | |
373 | case IRQ_TYPE_EDGE_BOTH: | |
374 | state = sprd_eic_get(chip, offset); | |
84aef4ed | 375 | if (state) { |
7bf0d7f6 BW |
376 | sprd_eic_update(chip, offset, |
377 | SPRD_EIC_LATCH_INTPOL, 0); | |
84aef4ed WL |
378 | sprd_eic_update(chip, offset, |
379 | SPRD_EIC_LATCH_INTCLR, 1); | |
380 | } else { | |
7bf0d7f6 BW |
381 | sprd_eic_update(chip, offset, |
382 | SPRD_EIC_LATCH_INTPOL, 1); | |
84aef4ed WL |
383 | sprd_eic_update(chip, offset, |
384 | SPRD_EIC_LATCH_INTCLR, 1); | |
385 | } | |
7bf0d7f6 | 386 | break; |
25518e02 BW |
387 | default: |
388 | return -ENOTSUPP; | |
389 | } | |
390 | ||
391 | irq_set_handler_locked(data, handle_level_irq); | |
392 | break; | |
393 | case SPRD_EIC_ASYNC: | |
394 | switch (flow_type) { | |
395 | case IRQ_TYPE_EDGE_RISING: | |
396 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTBOTH, 0); | |
397 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTMODE, 0); | |
398 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTPOL, 1); | |
84aef4ed | 399 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTCLR, 1); |
25518e02 BW |
400 | irq_set_handler_locked(data, handle_edge_irq); |
401 | break; | |
402 | case IRQ_TYPE_EDGE_FALLING: | |
403 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTBOTH, 0); | |
404 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTMODE, 0); | |
405 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTPOL, 0); | |
84aef4ed | 406 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTCLR, 1); |
25518e02 BW |
407 | irq_set_handler_locked(data, handle_edge_irq); |
408 | break; | |
409 | case IRQ_TYPE_EDGE_BOTH: | |
f785ffb6 | 410 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTMODE, 0); |
25518e02 | 411 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTBOTH, 1); |
84aef4ed | 412 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTCLR, 1); |
25518e02 BW |
413 | irq_set_handler_locked(data, handle_edge_irq); |
414 | break; | |
415 | case IRQ_TYPE_LEVEL_HIGH: | |
416 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTBOTH, 0); | |
417 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTMODE, 1); | |
418 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTPOL, 1); | |
84aef4ed | 419 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTCLR, 1); |
25518e02 BW |
420 | irq_set_handler_locked(data, handle_level_irq); |
421 | break; | |
422 | case IRQ_TYPE_LEVEL_LOW: | |
423 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTBOTH, 0); | |
424 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTMODE, 1); | |
425 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTPOL, 0); | |
84aef4ed | 426 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTCLR, 1); |
25518e02 BW |
427 | irq_set_handler_locked(data, handle_level_irq); |
428 | break; | |
429 | default: | |
430 | return -ENOTSUPP; | |
431 | } | |
432 | break; | |
433 | case SPRD_EIC_SYNC: | |
434 | switch (flow_type) { | |
435 | case IRQ_TYPE_EDGE_RISING: | |
436 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTBOTH, 0); | |
437 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTMODE, 0); | |
438 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTPOL, 1); | |
84aef4ed | 439 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTCLR, 1); |
25518e02 BW |
440 | irq_set_handler_locked(data, handle_edge_irq); |
441 | break; | |
442 | case IRQ_TYPE_EDGE_FALLING: | |
443 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTBOTH, 0); | |
444 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTMODE, 0); | |
445 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTPOL, 0); | |
84aef4ed | 446 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTCLR, 1); |
25518e02 BW |
447 | irq_set_handler_locked(data, handle_edge_irq); |
448 | break; | |
449 | case IRQ_TYPE_EDGE_BOTH: | |
102bbe34 | 450 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTMODE, 0); |
25518e02 | 451 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTBOTH, 1); |
84aef4ed | 452 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTCLR, 1); |
25518e02 BW |
453 | irq_set_handler_locked(data, handle_edge_irq); |
454 | break; | |
455 | case IRQ_TYPE_LEVEL_HIGH: | |
456 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTBOTH, 0); | |
457 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTMODE, 1); | |
458 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTPOL, 1); | |
84aef4ed | 459 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTCLR, 1); |
25518e02 BW |
460 | irq_set_handler_locked(data, handle_level_irq); |
461 | break; | |
462 | case IRQ_TYPE_LEVEL_LOW: | |
463 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTBOTH, 0); | |
464 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTMODE, 1); | |
465 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTPOL, 0); | |
84aef4ed | 466 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTCLR, 1); |
25518e02 BW |
467 | irq_set_handler_locked(data, handle_level_irq); |
468 | break; | |
469 | default: | |
470 | return -ENOTSUPP; | |
471 | } | |
5340f23d | 472 | break; |
25518e02 BW |
473 | default: |
474 | dev_err(chip->parent, "Unsupported EIC type.\n"); | |
475 | return -ENOTSUPP; | |
476 | } | |
477 | ||
478 | return 0; | |
479 | } | |
480 | ||
7bf0d7f6 BW |
481 | static void sprd_eic_toggle_trigger(struct gpio_chip *chip, unsigned int irq, |
482 | unsigned int offset) | |
483 | { | |
484 | struct sprd_eic *sprd_eic = gpiochip_get_data(chip); | |
485 | struct irq_data *data = irq_get_irq_data(irq); | |
486 | u32 trigger = irqd_get_trigger_type(data); | |
487 | int state, post_state; | |
488 | ||
489 | /* | |
490 | * The debounce EIC and latch EIC can only support level trigger, so we | |
491 | * can toggle the level trigger to emulate the edge trigger. | |
492 | */ | |
493 | if ((sprd_eic->type != SPRD_EIC_DEBOUNCE && | |
494 | sprd_eic->type != SPRD_EIC_LATCH) || | |
495 | !(trigger & IRQ_TYPE_EDGE_BOTH)) | |
496 | return; | |
497 | ||
498 | sprd_eic_irq_mask(data); | |
499 | state = sprd_eic_get(chip, offset); | |
500 | ||
501 | retry: | |
502 | switch (sprd_eic->type) { | |
503 | case SPRD_EIC_DEBOUNCE: | |
504 | if (state) | |
505 | sprd_eic_update(chip, offset, SPRD_EIC_DBNC_IEV, 0); | |
506 | else | |
507 | sprd_eic_update(chip, offset, SPRD_EIC_DBNC_IEV, 1); | |
508 | break; | |
509 | case SPRD_EIC_LATCH: | |
510 | if (state) | |
511 | sprd_eic_update(chip, offset, SPRD_EIC_LATCH_INTPOL, 0); | |
512 | else | |
513 | sprd_eic_update(chip, offset, SPRD_EIC_LATCH_INTPOL, 1); | |
514 | break; | |
515 | default: | |
516 | sprd_eic_irq_unmask(data); | |
517 | return; | |
518 | } | |
519 | ||
520 | post_state = sprd_eic_get(chip, offset); | |
521 | if (state != post_state) { | |
522 | dev_warn(chip->parent, "EIC level was changed.\n"); | |
523 | state = post_state; | |
524 | goto retry; | |
525 | } | |
526 | ||
527 | sprd_eic_irq_unmask(data); | |
528 | } | |
529 | ||
25518e02 BW |
530 | static void sprd_eic_handle_one_type(struct gpio_chip *chip) |
531 | { | |
532 | struct sprd_eic *sprd_eic = gpiochip_get_data(chip); | |
533 | u32 bank, n, girq; | |
534 | ||
535 | for (bank = 0; bank * SPRD_EIC_PER_BANK_NR < chip->ngpio; bank++) { | |
536 | void __iomem *base = sprd_eic_offset_base(sprd_eic, bank); | |
537 | unsigned long reg; | |
538 | ||
539 | switch (sprd_eic->type) { | |
540 | case SPRD_EIC_DEBOUNCE: | |
541 | reg = readl_relaxed(base + SPRD_EIC_DBNC_MIS) & | |
542 | SPRD_EIC_DATA_MASK; | |
543 | break; | |
544 | case SPRD_EIC_LATCH: | |
545 | reg = readl_relaxed(base + SPRD_EIC_LATCH_INTMSK) & | |
546 | SPRD_EIC_DATA_MASK; | |
547 | break; | |
548 | case SPRD_EIC_ASYNC: | |
549 | reg = readl_relaxed(base + SPRD_EIC_ASYNC_INTMSK) & | |
550 | SPRD_EIC_DATA_MASK; | |
551 | break; | |
552 | case SPRD_EIC_SYNC: | |
553 | reg = readl_relaxed(base + SPRD_EIC_SYNC_INTMSK) & | |
554 | SPRD_EIC_DATA_MASK; | |
555 | break; | |
556 | default: | |
557 | dev_err(chip->parent, "Unsupported EIC type.\n"); | |
558 | return; | |
559 | } | |
560 | ||
561 | for_each_set_bit(n, ®, SPRD_EIC_PER_BANK_NR) { | |
e91aafcb BC |
562 | u32 offset = bank * SPRD_EIC_PER_BANK_NR + n; |
563 | ||
564 | girq = irq_find_mapping(chip->irq.domain, offset); | |
25518e02 BW |
565 | |
566 | generic_handle_irq(girq); | |
e91aafcb | 567 | sprd_eic_toggle_trigger(chip, girq, offset); |
25518e02 BW |
568 | } |
569 | } | |
570 | } | |
571 | ||
572 | static void sprd_eic_irq_handler(struct irq_desc *desc) | |
573 | { | |
574 | struct irq_chip *ic = irq_desc_get_chip(desc); | |
25518e02 BW |
575 | |
576 | chained_irq_enter(ic, desc); | |
577 | ||
578 | /* | |
579 | * Since the digital-chip EIC 4 sub-modules (debounce, latch, async | |
b3241565 BG |
580 | * and sync) share one same interrupt line, we should notify all of |
581 | * them to let them check if there are EIC interrupts were triggered. | |
25518e02 | 582 | */ |
b3241565 | 583 | atomic_notifier_call_chain(&sprd_eic_irq_notifier, 0, NULL); |
25518e02 BW |
584 | |
585 | chained_irq_exit(ic, desc); | |
586 | } | |
587 | ||
b3241565 BG |
588 | static int sprd_eic_irq_notify(struct notifier_block *nb, unsigned long action, |
589 | void *data) | |
590 | { | |
591 | struct sprd_eic *sprd_eic = to_sprd_eic(nb); | |
592 | ||
593 | sprd_eic_handle_one_type(&sprd_eic->chip); | |
594 | ||
595 | return NOTIFY_OK; | |
596 | } | |
597 | ||
2788938b CG |
598 | static const struct irq_chip sprd_eic_irq = { |
599 | .name = "sprd-eic", | |
600 | .irq_ack = sprd_eic_irq_ack, | |
601 | .irq_mask = sprd_eic_irq_mask, | |
602 | .irq_unmask = sprd_eic_irq_unmask, | |
603 | .irq_set_type = sprd_eic_irq_set_type, | |
604 | .flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_IMMUTABLE, | |
605 | GPIOCHIP_IRQ_RESOURCE_HELPERS, | |
606 | }; | |
dbd31c71 BG |
607 | |
608 | static void sprd_eic_unregister_notifier(void *data) | |
609 | { | |
610 | struct notifier_block *nb = data; | |
611 | ||
612 | atomic_notifier_chain_unregister(&sprd_eic_irq_notifier, nb); | |
613 | } | |
614 | ||
25518e02 BW |
615 | static int sprd_eic_probe(struct platform_device *pdev) |
616 | { | |
617 | const struct sprd_eic_variant_data *pdata; | |
7777fa92 | 618 | struct device *dev = &pdev->dev; |
25518e02 BW |
619 | struct gpio_irq_chip *irq; |
620 | struct sprd_eic *sprd_eic; | |
4ed7d7dd | 621 | struct resource *res; |
25518e02 BW |
622 | int ret, i; |
623 | ||
7777fa92 | 624 | pdata = of_device_get_match_data(dev); |
25518e02 | 625 | if (!pdata) { |
7777fa92 | 626 | dev_err(dev, "No matching driver data found.\n"); |
25518e02 BW |
627 | return -EINVAL; |
628 | } | |
629 | ||
7777fa92 | 630 | sprd_eic = devm_kzalloc(dev, sizeof(*sprd_eic), GFP_KERNEL); |
25518e02 BW |
631 | if (!sprd_eic) |
632 | return -ENOMEM; | |
633 | ||
634 | spin_lock_init(&sprd_eic->lock); | |
635 | sprd_eic->type = pdata->type; | |
636 | ||
637 | sprd_eic->irq = platform_get_irq(pdev, 0); | |
15bddb7d | 638 | if (sprd_eic->irq < 0) |
25518e02 | 639 | return sprd_eic->irq; |
25518e02 BW |
640 | |
641 | for (i = 0; i < SPRD_EIC_MAX_BANK; i++) { | |
642 | /* | |
643 | * We can have maximum 3 banks EICs, and each EIC has | |
644 | * its own base address. But some platform maybe only | |
645 | * have one bank EIC, thus base[1] and base[2] can be | |
646 | * optional. | |
647 | */ | |
4ed7d7dd BW |
648 | res = platform_get_resource(pdev, IORESOURCE_MEM, i); |
649 | if (!res) | |
263ade71 | 650 | break; |
4ed7d7dd | 651 | |
7777fa92 | 652 | sprd_eic->base[i] = devm_ioremap_resource(dev, res); |
4ed7d7dd BW |
653 | if (IS_ERR(sprd_eic->base[i])) |
654 | return PTR_ERR(sprd_eic->base[i]); | |
25518e02 BW |
655 | } |
656 | ||
657 | sprd_eic->chip.label = sprd_eic_label_name[sprd_eic->type]; | |
658 | sprd_eic->chip.ngpio = pdata->num_eics; | |
659 | sprd_eic->chip.base = -1; | |
7777fa92 | 660 | sprd_eic->chip.parent = dev; |
25518e02 BW |
661 | sprd_eic->chip.direction_input = sprd_eic_direction_input; |
662 | switch (sprd_eic->type) { | |
663 | case SPRD_EIC_DEBOUNCE: | |
664 | sprd_eic->chip.request = sprd_eic_request; | |
665 | sprd_eic->chip.free = sprd_eic_free; | |
666 | sprd_eic->chip.set_config = sprd_eic_set_config; | |
667 | sprd_eic->chip.set = sprd_eic_set; | |
df561f66 | 668 | fallthrough; |
25518e02 | 669 | case SPRD_EIC_ASYNC: |
25518e02 BW |
670 | case SPRD_EIC_SYNC: |
671 | sprd_eic->chip.get = sprd_eic_get; | |
672 | break; | |
673 | case SPRD_EIC_LATCH: | |
25518e02 BW |
674 | default: |
675 | break; | |
676 | } | |
677 | ||
25518e02 | 678 | irq = &sprd_eic->chip.irq; |
2788938b | 679 | gpio_irq_chip_set_chip(irq, &sprd_eic_irq); |
25518e02 BW |
680 | irq->handler = handle_bad_irq; |
681 | irq->default_type = IRQ_TYPE_NONE; | |
682 | irq->parent_handler = sprd_eic_irq_handler; | |
683 | irq->parent_handler_data = sprd_eic; | |
684 | irq->num_parents = 1; | |
685 | irq->parents = &sprd_eic->irq; | |
686 | ||
7777fa92 | 687 | ret = devm_gpiochip_add_data(dev, &sprd_eic->chip, sprd_eic); |
25518e02 | 688 | if (ret < 0) { |
7777fa92 | 689 | dev_err(dev, "Could not register gpiochip %d.\n", ret); |
25518e02 BW |
690 | return ret; |
691 | } | |
692 | ||
b3241565 | 693 | sprd_eic->irq_nb.notifier_call = sprd_eic_irq_notify; |
dbd31c71 BG |
694 | ret = atomic_notifier_chain_register(&sprd_eic_irq_notifier, |
695 | &sprd_eic->irq_nb); | |
696 | if (ret) | |
7777fa92 | 697 | return dev_err_probe(dev, ret, |
dbd31c71 BG |
698 | "Failed to register with the interrupt notifier"); |
699 | ||
7777fa92 | 700 | return devm_add_action_or_reset(dev, sprd_eic_unregister_notifier, |
dbd31c71 | 701 | &sprd_eic->irq_nb); |
25518e02 BW |
702 | } |
703 | ||
704 | static const struct of_device_id sprd_eic_of_match[] = { | |
705 | { | |
706 | .compatible = "sprd,sc9860-eic-debounce", | |
707 | .data = &sc9860_eic_dbnc_data, | |
708 | }, | |
709 | { | |
710 | .compatible = "sprd,sc9860-eic-latch", | |
711 | .data = &sc9860_eic_latch_data, | |
712 | }, | |
713 | { | |
714 | .compatible = "sprd,sc9860-eic-async", | |
715 | .data = &sc9860_eic_async_data, | |
716 | }, | |
717 | { | |
718 | .compatible = "sprd,sc9860-eic-sync", | |
719 | .data = &sc9860_eic_sync_data, | |
720 | }, | |
721 | { | |
722 | /* end of list */ | |
723 | } | |
724 | }; | |
725 | MODULE_DEVICE_TABLE(of, sprd_eic_of_match); | |
726 | ||
727 | static struct platform_driver sprd_eic_driver = { | |
728 | .probe = sprd_eic_probe, | |
729 | .driver = { | |
730 | .name = "sprd-eic", | |
731 | .of_match_table = sprd_eic_of_match, | |
732 | }, | |
733 | }; | |
734 | ||
735 | module_platform_driver(sprd_eic_driver); | |
736 | ||
737 | MODULE_DESCRIPTION("Spreadtrum EIC driver"); | |
738 | MODULE_LICENSE("GPL v2"); |